What do you mean by "agent-independent"?
That two agents can differ in their behavior and perception of actions but that any fundamental difference about a set of moral laws can be considered a failure-mode as those laws are implied by the lower levels of the universe the two agents are part of. I thought that moral realism proposes that 'Killing: generally wrong' is on the same level as 'Faster than light travel: generally wrong', that moral laws are intersubjective verifiability and subject to empirical criticism. I didn't think that anyone actually believes that 'Killing: generally wrong' can be derived as an universal and optimal strategy.
I'm pretty sure I don't understand anything you just said. Sorry.
In You Provably Can't Trust Yourself, Eliezer tried to figured out why his audience didn't understand his meta-ethics sequence even after they had followed him through philosophy of language and quantum physics. Meta-ethics is my specialty, and I can't figure out what Eliezer's meta-ethical position is. And at least at this point, professionals like Robin Hanson and Toby Ord couldn't figure it out, either.
Part of the problem is that because Eliezer has gotten little value from professional philosophy, he writes about morality in a highly idiosyncratic way, using terms that would require reading hundreds of posts to understand. I might understand Eliezer's meta-ethics better if he would just cough up his positions on standard meta-ethical debates like cognitivism, motivation, the sources of normativity, moral epistemology, and so on. Nick Beckstead recently told me he thinks Eliezer's meta-ethical views are similar to those of Michael Smith, but I'm not seeing it.
If you think you can help me (and others) understand Eliezer's meta-ethical theory, please leave a comment!
Update: This comment by Richard Chappell made sense of Eliezer's meta-ethics for me.